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authorJakob Unterwurzacher2016-04-20 22:47:31 +0200
committerJakob Unterwurzacher2016-04-20 22:47:31 +0200
commit4d79fba2853b7d0b5f4cafc4aab55b1c448282e3 (patch)
treea7451051002587c32c86168e0fa3abe0e2e669ff
parentf035d3efba6d62540053d21c772d70f38c8e6e97 (diff)
prelloc: warn and continue if fallocate(2) is not supported
This makes gocryptfs work at all on ZFS. See https://github.com/rfjakob/gocryptfs/issues/22 .
-rw-r--r--internal/fusefrontend/compat_linux.go19
1 files changed, 18 insertions, 1 deletions
diff --git a/internal/fusefrontend/compat_linux.go b/internal/fusefrontend/compat_linux.go
index 4108792..8a20d5d 100644
--- a/internal/fusefrontend/compat_linux.go
+++ b/internal/fusefrontend/compat_linux.go
@@ -1,6 +1,13 @@
package fusefrontend
-import "syscall"
+import (
+ "sync"
+ "syscall"
+)
+
+import "github.com/rfjakob/gocryptfs/internal/toggledlog"
+
+var preallocWarn sync.Once
// prealloc - preallocate space without changing the file size. This prevents
// us from running out of space in the middle of an operation.
@@ -13,6 +20,16 @@ func prealloc(fd int, off int64, len int64) (err error) {
// signal and we should try again.
continue
}
+ if err == syscall.EOPNOTSUPP {
+ // ZFS does not support fallocate which caused gocryptfs to abort
+ // every write operation: https://github.com/rfjakob/gocryptfs/issues/22
+ preallocWarn.Do(func() {
+ toggledlog.Warn.Printf("Warning: The underlying filesystem " +
+ "does not support fallocate(2). gocryptfs will continue working " +
+ "but is no longer resistant against out-of-space errors.\n")
+ })
+ return nil
+ }
return err
}
}